birds gas exchange

• how are birds lungs similar to those of mammals


  they use haemoglobin to exchange gases
• why do birds require more oxygen


  they fly
• which vertebrate has a more efficient gas exchange system


  birds
• what is the first step of gas exchange in birds


  oxygenated air is brought in through the mouth and travels to the the posterior air sacs via the trachea
• what happens when the air is in the posterior air sacs


  the air then passes through the lungs and hen into the anterior sacs before exiting back out through the trachea